Basic implementation for cover image uploads

Signed-off-by: Suki <suki@missallsunday.com>
BreezeAjax::cover()  a basic idea of what is going to happen inside it

Signed-off-by: Suki <suki@missallsunday.com>
Merge branch 'cover_images' of git@github.com:MissAllSunday/Breeze.git into likes